﻿// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
// Copyright (c) 2011, Dr. Masroor Ehsan
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above copyright
//       notice, this list of conditions and the following disclaimer in the
//       documentation and/or other materials provided with the distribution.
//     * Neither the name of the author nor the
//       names of its contributors may be used to endorse or promote products
//       derived from this software without specific prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// 
// $Author: masroore@gmail.com $
// $Id: CacheProvider.cs 37 2011-10-21 15:00:21Z masroore@gmail.com $
// $Rev: 37 $
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

using System;
using Microsoft.Practices.EnterpriseLibrary.Caching;
using Microsoft.Practices.EnterpriseLibrary.Caching.Expirations;
using Microsoft.Practices.EnterpriseLibrary.Common.Configuration;

namespace MaxTrader.Caching
{
    public class CacheProvider
    {
        private static ICacheManager _cacheManager;

        private static ICacheManager CacheManager
        {
            get
            {
                return _cacheManager ??
                       (_cacheManager = EnterpriseLibraryContainer.Current.GetInstance<ICacheManager>());
            }
        }

        /// <summary>
        ///   Adds new item to cache. If another item already exists with the same key, that item 
        ///   is removed before the new item is added. If any failure occurs during this process, 
        ///   the cache will not contain the item being added. Items added with this method will 
        ///   be expired, and will have a Normal priority.
        /// </summary>
        /// <param name = "key">The key.</param>
        /// <param name = "value">The value.</param>
        public static void Put(string key, object value)
        {
            CacheManager.Add(key, value);
        }

        /// <summary>
        ///   Adds new item to cache. If another item already exists with the same key, that item 
        ///   is removed before the new item is added. If any failure occurs during this process, 
        ///   the cache will not contain the item being added.
        /// </summary>
        /// <param name = "key">The key.</param>
        /// <param name = "value">The value.</param>
        /// <param name = "minutes">The minutes.</param>
        public static void Put(string key, object value, int minutes)
        {
            CacheManager.Add(key, value, CacheItemPriority.Normal, null, new SlidingTime(TimeSpan.FromMinutes(minutes)));
        }

        /// <summary>
        ///   Adds new item to cache. If another item already exists with the same key, that item 
        ///   is removed before the new item is added. If any failure occurs during this process, 
        ///   the cache will not contain the item being added. Items added with this method will 
        ///   not be expired, and will have a High priority.
        /// </summary>
        /// <param name = "key">The key.</param>
        /// <param name = "value">The value.</param>
        public static void PutNoExpire(string key, object value)
        {
            CacheManager.Add(key, value, CacheItemPriority.High, null, new NeverExpired());
        }

        /// <summary>
        ///   Removes all items from the cache. If an error occurs during the removal, the cache is left unchanged.
        /// </summary>
        public static void Flush()
        {
            CacheManager.Flush();
        }

        /// <summary>
        ///   Returns true if key refers to item current stored in cache
        /// </summary>
        public static bool Contains(string key)
        {
            return CacheManager.Contains(key);
        }

        /// <summary>
        ///   Removes the given item from the cache. If no item exists with that key, this method does nothing.
        /// </summary>
        public static void Remove(string key)
        {
            CacheManager.Remove(key);
        }

        /// <summary>
        ///   Returns the value associated with the given key
        /// </summary>
        /// <param name = "key">Key of item to return from cache</param>
        /// <returns>Value stored in cache</returns>
        public static object Get(string key)
        {
            return CacheManager.GetData(key);
        }
    }
}